ZyXEL NBG420N Manuel d'utilisateur télécharger pdf (Page 178)

Chapter 15 IPSec VPN

NBG420N User’s Guide

178

IKE Phase 1

Negotiation Mode Select Main or Aggressive from the drop-down list box. Multiple SAs

connecting through a secure gateway must have the same negotiation mode.

Encryption Algorithm Select which key size and encryption algorithm to use in the IKE SA. Choices

are:

DES - a 56-bit key with the DES encryption algorithm

3DES - a 168-bit key with the DES encryption algorithm

The NBG420N and the remote IPSec router must use the same algorithms and

keys. Longer keys require more processing power, resulting in increased

latency and decreased throughput.

Authentication

Algorithm

Select which hash algorithm to use to authenticate packet data in the IKE SA.

Choices are SHA1 and MD5. SHA1 is generally considered stronger than MD5,

but it is also slower.

SA Life Time

(Seconds)

Define the length of time before an IKE SA automatically renegotiates in this

field. It may range from 180 to 3,000,000 seconds (almost 35 days).

A short SA Life Time increases security by forcing the two VPN gateways to

update the encryption and authentication keys. However, every time the VPN

tunnel renegotiates, all users accessing remote resources are temporarily

disconnected.

Key Group Select which Diffie-Hellman key group (DHx) you want to use for encryption

keys. Choices are:

DH1 - use a 768-bit random number

DH2 - use a 1024-bit random number

Pre-Shared Key Type your pre-shared key in this field. A pre-shared key identifies a

communicating party during a phase 1 IKE negotiation. It is called "pre-shared"

because you have to share it with another party before you can communicate

with them over a secure connection.

Type from 8 to 31 case-sensitive ASCII characters or from 16 to 62

hexadecimal ("0-9", "A-F") characters. You must precede a hexadecimal key

with a "0x” (zero x), which is not counted as part of the 16 to 62 character range

for the key. For example, in "0x0123456789ABCDEF", “0x” denotes that the key

is hexadecimal and “0123456789ABCDEF” is the key itself.

Both ends of the VPN tunnel must use the same pre-shared key. You will

receive a “PYLD_MALFORMED” (payload malformed) packet if the same pre-

shared key is not used on both ends.

IKE Phase 2

Encapsulation Mode Select Tunnel mode or Transport mode.

IPSec Protocol Select the security protocols used for an SA.

Both AH and ESP increase processing requirements and communications

latency (delay).

If you select ESP here, you must select options from the Encryption Algorithm

and Authentication Algorithm fields (described below).

Encryption Algorithm Select which key size and encryption algorithm to use in the IKE SA. Choices

are:

DES - a 56-bit key with the DES encryption algorithm

3DES - a 168-bit key with the DES encryption algorithm

The NBG420N and the remote IPSec router must use the same algorithms and

keys. Longer keys require more processing power, resulting in increased

latency and decreased throughput.

Table 64 Security > VPN > Rule Setup: IKE (Advanced) (continued)

LABEL DESCRIPTION

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